Brake-rigging.



T. L. BURTON.

'BRAKE RJGGING. APPLICATION FILED AUG.27, 1913.

Patented; Dec. 28, 1915 WITNESSES till:

died FARM FTF.

THOMAS L. BURTON, OF PITTSBURGH, PENNSYLVANIA, AssIGNoR, BY 'MEsNE ASSIGN- MENTS, To AMERICAN BRAKE COMPANY, OF sT. LoUIs, MIssoURI, A CORPORATION OF .lVIISSOURI.

BRAKE-RIGGIN Gr.

iiecavv.

Patented Dec. 2e, Jlfillfia.

Y Application filed August 27, 1913. Serial No. 786,838.

shoes are appli to both sides of each pair 7 of truck wheels.

The princlpal ob]ect of my invention is to provide an improved construction of tins type in which a double set of truck levers I and rods are employed, one at each side of the truck, and having an intermediate floating lever located near the center of the truck for each of the two sets of truck rods and levers. The power from the brake cylin-' der is applied to both of said intermediate floating levers and from them is transmitted in opposite directions,.directly to the respective truck levers, the leverage of which is designed to transmit substantially equalized pressure to all of the brake shoes.

In the accompanying drawings: Figure 1 is a plan of one form of clasp type brake applied to a four wheeled truck, and em-' bodying my improvement; Fig; 2, a longitudinal sectional view of the same, showing one set of truck rods .and levers in elevation; Fig. 3, a half plan; and Fig. 4, a sectional view showing a modification as applied to a six wheeled truck.

My improvement is especially adapted for use in connection with pivoted trucks having a plurality of pairs of wheels, usually four or six, employed at both ends of thecar, and having brake shoes applied to both sides of each pair of wheels.

According to the construction shown in Figs. 1 and 2. of the drawings, the improvement is applied to a four wheeled truck having brake beams, B B, B and 13*, at both sides of each pair of wheels, and two sets of truck levers, 1, 2, 3, andfa, with coupling rods, 8 and 9, these parts being duplicated upon opposite sides'of the truck. The live truck levers, 2 and 3,. are pivotally connected at their lower ends to the brake beams, B and B having brake shoes at their ends, supported by hangers, H, while the dead truck levers, 1 and 4, are pivotally connected to the respective brake beams,

Be it known that I, TIIoMAs L. BURTON,.

- tive oppositely extending B and B, and carry brake shoes at their lower ends.

According to my present improvement, the stresses from the intermediate floating lever 5, are transmitted in opposite directions directly to the truck levers through uniform stress connections respectively, as for instance in Figs. 1 and 2, the pull rod 11, connects the end of lever, 5, with the upper end of truck lever, 3, while the stress 'in the opposite direction is transmitted directly through rods, 7zand 10, to the truck lever, 2. These pull rods, 7 and 10, may be regarded as two sections of single uniform stress connectio-ns since the cross bar, 6, is interposed merely for the purpose of making an oii se't' intotl'i'e' plane of the vert'ical truck lever, 2, and avoid locating the rods at an angle to theflongitudinal lines of the truck. It will be evident that the same result may be accomplished and the bar, 6, be eliminated, :by. shifting the truck lever, 52, intothe same 'plane with the pull rod, 7. I

The stresses transmitted from the floating lever, 5, by the respective rods, 7 and 11, will, of course, he unequal, since the leverage is different, and 'in order to compensate for the inequality-of stress, the leverage of the truck levers, 3 and L, in one direction is different from that of the truck levers, 2 and 1, in the opposite direction, the leverage of said truck levers being so calculated as to produce a substantially equalized braking pressure upon all the brake shoes.

' As shown in Figs. 1 and 2, the intermediate levers, 5, which are located near the center plate, C, of the truck, stantially horizontal, and the power from the brake cylinder is applied by means of pull rod, 12, and equalizer, 1'2, connected to the inner ends of the floating levers, 5.

'cally at each side of the truck, and said levers are coupled by means of the respeclinks, 10, and 11, directly with the truck levers, 15 and 16, which are pivotally connected at their lower ends to the respective brake beams, B and are sub- 4 B on opposite sides of the center pair of 11-2 13 and I-l, respectively,

four wheeled truck construction.

ble each side of the truck," of an intermediate.

the truck,"

levers, which mediate brake beams, .13 B B9, and B, are supported by hangers, H, While the combined lever and hangeris employed at the end or dead truck levers, land 4, as before described. i

In all of these modifications,it will now be seen'that the power from the brake cylinder p'ull rod is. applied to an intermediate floatingf leverdlocated near the center of the truck andhaving connections for transmitting jthe stresses inopposite directions,

directly to ftl ie respective truck levers, the

leverage of the latteifbeing calculated to 'produeexanflequalizedpressure upon all of the brake shoes. I

Having now described my invention, What I claim asneiv and desire to secure by Letters Patent is 1. In a brake rigging for pivoted trucks having a plurality of pairs of Wheels, the combination with. brake shoes applied to both sides of each pair'of wheels and a douset of truck levers and rods, one set at floating lever upon each side-pf and having the respective uniform stress connections extending in opposite directions direct to the truck levers.

.2. In a brake rigging for pivoted trucks having a plurality of pairs of wheels, the

produce an equalized b1'*ak ng pressure. The brake shoes for all intercombination with brake beams applied to both sides of each pair of Wheels, and a set of truck said brake beams upon each side of the truck, of an intermediate floating lever having a rod connection of uniform stress extending in one direction directly to one truck lever and another rod connection of uniform stress extending on the opposite direction directly to another truck lever, and a brake cylinder pull rod for operating said intermediate lever.

23. In a brake rigging for pivoted trucks having a plurality of pairs of wheels, the combination with brake beams applied to both sides of each pair of wheels, and a setof truck levers and rods connected to said brake beams upon each side of the truck, of an intermediate floating lever having a rod connected toward one end of the truck, and another rod connection of uniform stress extending directly to another truck other end of the truck, said truck levers directly to a truck lever lever toward the levers and rods connected to v having a different leverage for producing substantially equalized braking pressure.

4. In a brake rigging for pivoted trucks having a plurality of pairs of Wheels, the combination with brake beams applied to both sides of each pair of wheels, and a set of truck leversand rods connected to said brake beams upon each side of the truck, of an intermediate floating lever for each set of truck levers, and having the respective rod connections of uniform stress extending in opposite directions to two difl'erent truck levers, and 1 brake 'cylinder pull rod with an equalizer connected to said intermediate floating levers.

THOMAS L. BURTON. Witnesses:

J. SNOWDEN BELL, EDWARD A. WVRI HTI 

